Abstract: A microarray hybridization assembly for conducting hybridization assay analysis is disclosed. The microarray assembly comprises a slide, a slide cover, and a spacer disposed between the slide and slide cover. The slide cover is placed over the slide and the spacer maintains a gap between the parallel surfaces of the slide and slide cover to create a reaction region for hybridization reactions between attached probe molecules and target molecules of a hybridization solution. The slide assembly is placed into a heat shrinkage bag. The bag and slide assembly are then heated in a heat cycle sufficient to seal the bag around at least three sides of the slide assembly. An optional heat shrinkage cap can be fitted over the fourth side of the slide assembly and heated in a second heat cycle to seal the fourth side of the slide assembly after a hybridization solution is introduced into the reaction region of the slide assembly.